Pneumatic footage transmitter



w. L. LANKFORD. JR. ET AL 3, 35,754

PNEUMATIC. FOOTAGE TRANSMITTER 4 Sheets-Sheet 1 Filed Nov. b, 1964INVENTORS William L Lankford, Jr. C'ar/ 5. Ward Roy L. Van W/hk/e 1AGENT Filed Nov. 5, 1964 4 Sheets-Sheet Aug-.15, 1967 T w. L. LANRFORD,JR.. ET AL 3,335,754 I PNEUMATIC FOOTAGE TRANSMITTER & INVENTORS WilliamL. Lem/(Ford, Jr.

Carl 5. Ward Roy L. Van'W/nk/e mwawfi KWMWM I AGENT Aug. 15; 1967 'w, L.LANKFORHD. JR. ET AL 4 PNEUMATIC FOOTAGE TRANSMITTER Filed Nov. 1964 4Sheets-Sheet s INVENTORS William L. Lankford, Jr Carl S. Wbrd Roy L. VanWinkle AGENT Aug. 15, 1967 w. LANKFORD, JR.. ET AL 3,33

PNEUMATIC FOOTAGE TRANSMITTER Filed Nov. .3, 1964 V 4 Sheet sSheet 4INVENTORS VW/l/amL. Largd'ord, Jr.

Carl 5. War Roy L. Van Winkle MJWJKZZM/M AGENT United States Patent3,335,754 PNEUMATIC FOOTAGE TRANSMITTER William L. Lankford, Jr., andCarl S. Ward, Oklahoma City, and Roy L. Van Winkle, Edmond, 0kla.,assignors to The Geolograph Company, Oklahoma City, Okla, a

corporation of Oklahoma Filed Nov. 5, 1964, Ser. No. 409,193 16 Claims.(Cl. 137624.15)

ABSTRACT OF THE DISCLOSURE A pneumatic footage transmitter adapted to beused in conjunction with a mechanical recorder and including two pulsingvalves and a selector valve, one of the pulsing valves being pulsed, forexample, at the end of each foot of drilling, the other of the pulsingvalves being pulsed at the end of each five feet of drilling, thetransmitter being provided with an output port connecting with theselector valve, the selector valve also being connected to the twopulsing valves, and means for moving the selector valve so as toselectively, or alternatively, connect the output port with the one footpulsing valve or the five foot pulsing valve.

This invention relates to improvements in recording apparatus forvarious pertinent data relative to a well drilling operation and moreparticularly, but not by way of limitation, to a transmitter fordirecting a pneumatic impulse to a recorder located remotely withrespect to the site of the drilling rig.

In U.S. Patent No. 2,883,256, a stylus is provided for recording apenetration trace on a chart which is movable at a uniform rate relativeto the stylus. During the drilling operation, the stylus will bedeflected horizontally across the chart from a given reference line(vertical) and immediately back again to this reference line each timethat the drill bit penetrates one foot into the earth. Also, for eachalternate foot means are provided for varying the amount of thehorizontal deflection. Thus, the resulting penetration trace will appearessentially as a vertical ref-, erence line having a plurality ofhorizontal lines projecting outwardly therefrom and to one side thereof.The distance (measured along the vertical line) between any givenhorizontal line and the next succeeding horizontal line represents thetime required to drill the intervening foot. Therefore, assuming thatthe proper weight is on the drill bit, etc., when the horizontal linesare spaced relatively far apart, one can readily perceive that thedrilling is occurring at a relatively slow rate. On the other hand, whenthe horizontal lines are spaced close together, one can see that thedrilling operation is proceeding at a relatively fast rate.

In U.S. Patent No. 3,010,777, there is .provided a recording apparatuswhich is similar in some respects to that of the aforementioned patent.For example, the structure of Patent No. 3,010,777 permits thedeflection of a stylus horizontally for each foot of penetrationsubstantially in the manner described above; however, the latter patentalso includes additional structure such that the horizontal deflectionof this stylus can be caused to occur only for every fifth foot ofpenetration so that, under conditions of extremely fast drilling, a morereadable and more useful record can be produced.

Whereas recorders of the type described in the aforementioned patentsare generally located on or at the structure of the drilling rig itself,a recorder designed for producing substantially the same recordedinformation outlined above at a location somewhat remote from thedrilling rig is disclosed in a co-pending application Ser. No. 223,358,filed Sept. 13, 1962, and entitled Pneumatic ice Penertation Recorder,now Patent No. 3,214,762, one of the inventors thereof being aco-inventor of the present application. The structure of the co-pendingapplication Ser. No. 223,358 includes two basic components: First, therecorder itself which is pneumatically operated and located at a pointwhich may be remote with respect to the drilling rig; and secondly, atransmitter which provide pneumatic signals for controlling the recorderand which transmitter is located on or at the drilling rig. However,

it is necessary to alter the internal structure of the existingrecording unit to which the transmitter is attached in order to actuatethe transmitter.

The present invention contemplates a transmitter for directing pneumaticsignals to a recording structure similar to that disclosed in theaforementioned co-pending application. The transmitter of the presentinvention may be directly but externally attached to a. recorder of thetype disclosed in U.S. Patent No. 3,010,777 without alteration of theinternal structure of the recorder itself. The mechanical motions of therecorder may be converted to pneumatic signals which are in turntransmitted to a remote recorder such as that disclosed in the co-pendint application. Of course, it is to be noted that the transmitterassembly of the present invention may be attached to a unit containing ametering wheel only, thereby eliminating the recorder structure such asthat shown in Patent No. 3,010,777. In this instance, the pneumaticsignals would be transmitted to a recorder other than the recordinginstrument disclosed in the aforesaid patent thereby replacing therecord previously recorded on said apparatus.

The remote footage transmitter assembly of the present invention isparticularly designed and constructed to send a suitable pneumaticimpulse, preferably of p.s.i. but not limited thereto, for each foot ofwell drilling progress, and a separate and distinct similar 80 psi.pneumatic impulse for each desired increment of drilling. By providingthese two different impulses, it is possible to achieve thecharacteristic one foot penetration recording and five foot off-setrecording disclosed in Patent No. 3,010,777. In addition, thetransmitter assembly of the present invention is provided with a manualswitch which alters the operation of the transmitter for sending apneumatic signal to the recorder for each fifth foot corresponding tofive feet of well drilling progress in lieu of the one foot penetrationrecording. As set forth in Patent No.

3,010,777, this five foot penetration recording system is preferable foruse with a drilling condition, commonly called fast drilling, in orderto facilitate visual interpretation of the data on the chart. In a fastdrilling operation, recording of individual footage marks often resultsin marks on the chart disposed in such close relationship that it isdifiicult if not impossible to distinguish therebetween. Thus, during afast drilling operation, the five foot recording systemmay be utilizedwhich eliminates individual footage marks and records only each fifthfoot of drilling thereby opening up the recording data on the time scaleofthe chart. Of course, in drilling operations requiring slower time forpenetration of drilled footage, it is usually desirable to mark orrecord on the chart for each foot of drilling.

It is an important object of this invention to provide a transmitterassembly for directing pneumatic impulses to a remotely disposedrecorder for operation of the recorder to provide well drillinginformation.

It is another object of this invention to provide a transmitter assemblywhich may be externally attached directly to substantially any suitablepresently existing recording device for actuation thereby to transmitpneumatic signals to a recorder which is disposed remotely therefrom.Another object of this invention is to provide a remote footagetransmitter assembly which may be secured directly to a suitablerecording apparatus for actuation thereby without alteration of theinternal structure of the recorder itself.

Other and further objects and advantageous features of the presentinvention will hereinafter more fully appear in connection with adetailed description of the drawings in which:

FIGURE 1 is a perspective view of a recorder apparatus having atransmitter assembly embodying the present invention secured thereto.

FIGURE 2 is a plan view of a transmitter assembly embody the invention,with the cover plate remove-d for purposes of illustration.

FIGURE 3 is a perspective view of a cam and gear actuating mechanism ofthe invention.

FIGURE 4 is a perspective view of the mechanical switching arrangementfor selectively arranging the transmitter assembly for one foot or fivefeet penetration recording.

FIGURE 5 is a diagrammatic view of a transmitter embodying theinvention.

Referring to the drawings in detail, reference character generallyindicates a recording unit which may be of any suitable type, such asdisclosed in the Melton et al. Patent No. 3,010,777, and which isusually installed at the site of a drilling rig (not shown). Therecording unit 10, as depicted in FIGURE 1, includes a housing or casing12 having a cover 14 hingedly secured thereto in any suitable manner,such as by the hinge 16 whereby the cover 14 may be raised to permitaccess to the interior of the recorder 10. A tube 18 is secured to thetop of the casing or housing 12 by means of a plate 20 and a U- bolt 22,or the like, which clamps the tube 18 to the plate 20. A cable 24 havingone end secured to the conventional tackle mechanism (not shown) of therotary drill rig (not shown) passes through the tube 18 and into theinterior of the recording unit 10.

A winding drum 26 is mounted in the proximity of the tube 18 in anysuitable manner, such as by a plate 28 secured to the housing 12 and asuitable bracket arrangement, a portion of which is shown at 29 inFIGURE 1. A shaft 30 is secured to the bracket 29 in any suitable mannerfor receiving the drum 26 thereon and the drum takes up the cable 24after the cable has passed through the apparatus 10. The drum 26 ispreferably provided with a suitable mechanism such as a spring motor(not shown) which is normally biased to rotate the drum in a directionto wind the cable 24 thereon but yet is yieldable responsive to the pullof the cable 24 to permit unwinding of the cable from the drum 26. Thedrum 26 is, thus, fully capable of closely following the movements ofthe drill string. The cable extending downwardly through the tube 18 andinto the apparatus 10 preferably extends around a suitable pulley (notshown) provided within the apparatus 10, said pulley being connected toa rotatable shaft (not shown) through a suitable clutching arrangement(not shown) whereby the shaft may be rotated in accordance with themovement of the cable 24 as set forth in the aforementioned Patent No.3,010,777. A dial 29 having a pivotal or rotatable pointer 31 inassociation therewith is normally provided on the housing 12 and inconnection with the aforementioned rotatable shaft whereby the pointeris rotated thereby. However, in the present instance, the dial 29 andpointer 31 are preferably removed from the casing or housing 12 for apurpose as will be hereinafter set forth.

A transmitter assembly generally indicated at 32 is secured to thehousing in any suitable manner, and preferably by means of a pluralityof threaded members 33 which are arranged for engagement with thethreaded apertures (not shown) normally provided in the housing 12 forsecuring of the dial 29 thereto. The transmitter 32 comprises an outerhousing 34 which may be attached directly to the front of the recorderhousing by means of the screws 33 and the housing 34 is provided with aremovable cover plate 32 secured thereto in any well known 4 manner,such as by a plurality of spaced screws 38. A shaft 40 is provided inthe housing 34, as particularly shown in FIGURE 2, and extends throughan aperture (not shown) provided in the housing 34 for connection withthe rotatable shaft of the recorder unit 10 for rotation simultaneouslytherewith. The aperture for receiving the shaft 40 is of a largerdiameter than the diameter of the shaft 40 for facilitating orientationof the shaft 40 with respect to the housing 34 whereby the shaft 40 maybe connected with the rotatable shaft of the recorder unit 10 in theevent the location of the rotatable shaft is not exactly the same foreach individual recorder unit.

The shaft 40 is provided with a reduced neck portion 41 at the outerextremity thereof which extends through an aperture (not shown) in thecover plate 36. The dial 29 is secured to the cover plate 32 in such amanner that the pointer 31 may be secured to the neck portion 41 wherebyrotation is transmitted to the pointer. The dial 29 is suitably markedwith numerical indicia as shown in FIGURE 1.

A cam member comprising two substantially identical but oppositelydisposed half sections 42 and 44 is secured around the outer peripheryof the shaft 40 by a pair of oppositely disposed threaded studs 46. Thestuds 46 extend through an aperture provided in the half section 44 andinto threaded engagement with an aligned bore provided in the other halfsection 42, with the studs 46 extending substantially tangentially withrespect to the outer periphery of the shaft 40 whereby tightening of thescrews will securely retain the half sections 42 and 44 around the shaft40.

As particularly shown in FIGURE 3, when the cam 42-44 is thus secured inposition around the shaft 40, the cam sections 42 and 44 provide anouter periphery adjacent one end thereof comprising a substantiallycylindrical surface 48 extending around one portion of the circumferencethereof and a cut-away or recessed portion 50 extending around anotherportion of the circumference thereof. It is preferable to provide twooppositely disposed arcuate or cylindrical portions 48 and twooppositely disposed recessed portions 50 for a purpose as will behereinafter set forth.

A ring gear 52 is secured to the outer periphery of the shaft 40 in anysuitable manner such as by a set screw, or the like (not shown), and ispreferably disposed adjacent the cam sections 42 and 44, as particularlyshown in FIGURE 3. The gear 52 engages a second gear 54 journalled on ashaft 56 which is secured to the housing 34 by a threaded stud member58. The stud member 58 is off-set with respect to the axial centerlineof the shaft 56 whereby rotation of the shaft 56 about the stud 58 willprovide an eccentric movement for the outer periphery of the shaft. Inthis manner, the position of the ring gear 54 may be adjusted ororiented with respect to the gear 52 to assure a meshing of the gears 52and 54 regardless of any variance in the location of the shaft 40 asdetermined by differences in the location of the rotatable shaft of theindividual recorder units 10 with which the transmitter 32 may beutilized. In addition, the outer end of the shaft 56 is preferablyprovided with an enlarged head portion 60 which may have the outerperiphery thereof knurled in order to facilitate manual rotation of theshaft 56 for adjusting of the position of the gear 54. It is to beunderstood that rotation of the shaft 56 for orientation of the gear 54is accomplished prior to the full tightening of the stud 58 and when thegear 54 is properly positioned with respect to the gear 52, the stud 58may be fully tightened in the housing 34 for precluding further rotationof the shaft 56.

The ratio between the gears 52 and 54 is preferably two and one-half toone whereby the gear 54 Will be rotated through one complete revolutionupon two and one-half revolutions of the gear 52. Whereas this is apreferable ratio between the two gears, it is to be understood thatthere is no limitation intended and any suitable gear ratio may beutilized in accordance with the desired performance of the transmitter32. An arcuate lug or pawl 62 is secured to one face of the gear 54 andextends perpendicularly outwardly therefrom for a purpose as will behereinafter set forth. The cam 4244 and gear 52 are simultaneouslyrotated by the shaft 40, which in turn is rotated by the shaft of therecorder unit 10, whereby the rotation of the cam and gear 52 issubstantially constant in timed relation with the drilling progress. Thecam 4244 and gear 52 are preferably driven in such a manner that theymake one complete revolution for each two feet of drilling. Since theratio between the gears 52 and 54 is two and one-half to one, the gear54 and lug 62 carried thereby will be rotated through one completerevolution for each five feet of drilling.

It should be pointed out that the conventional drilling rig has a supplyof air under pressure which is used for operating the various clutches,brakes, etc., associated with the motors and drives for the drillingequipment. This supply of air will be referred to as rig air. Rig airpasses through a suitable fitting, such as the elbow 64, through asuitable pressure control valve or regulator 66, through a conduit 68,through a T-fitting 70, and through a second conduit 72 to a camactuated valve 74. The T-fitting is suitably connected with a second camactuated valve 76 for directing a portion of the pneumatic fluid theretofor a purpose as will be hereinafter set forth.

The valve 74 is provided with an inlet 73 and an outlet 75 and inaddition has associated therewith an operating arm 78 which is pivotallysecured at 80 to a support bracket 82 carried by the valve 74. A rollermember 84 is journalled on the opposite end of the arm 78 for engagingthe outer periphery of the cam 42-44. In addition, a suitable springmember 86 is anchored between the outer extremity of the arm 78 and thevalve 74- for constantly urging the arm 78 in a counterclockwiserotational direction about the pivot pin 80 as viewed in FIGURE 2 and inengagement with a spring urged plunger 79 of the valve 74. The spring 86precludes any flipping of the arm 78 during reverse or counterclockwiserotation of the shaft 40. The roller 84 is in engagement with the camsurface 48 throughout a portion of the cam rotation whereby the arm 78is urged in a counterclockwise direction for urging the plunger 79 in adirection for providing communication between the inlet 73 and outlet 75for opening the valve 74 to permit the passage of pneumatic fluidtherethrough to a conduit 88. When the cam 42-44 rotates through asufficient distance for moving one of the recesses 50 into alignmentwith or in the proximity of the roller 84, the roller is released fromthe engagement with the arcuate surface and the arm 7 8 moves slightlyin a clockwise rotational direction about the pivot 80 whereby theplunger 79 may be moved by the spring pressure thereof whereby the valve74 is closed to preclude the flow of fluid therethrough. The clockwiserotational movement of the arm 78 is limited by the spring 86, and thusas the cam continues to rotate, the next succeeding arcuate surface 48is brought into contact or engagement with the roller 84 whereby the arm78 is rotated in a counterclockwise direction for opening of the valve74. Since the cam 42-44 preferably rotates through one completerevolution for each two feet of drilling, it will be apparent that thevalve 74 is opened for every one foot of drilling for a purpose as willbe hereinafter set forth.

The conduit 88 extends between the valve 74 and a suitable fitting 90such as a T-fitting, or the like, for directing the fluid to aquick-release or quick-exhaust valve 92 as well as to a conduit 94extending to a suitable fitting 96 for a purpose as will be hereinafterset forth. The quick release valve 92 is described in detail in aco-pending application Ser. No. 802,968, filed Mar. 30, 1959, andentitled Control Device for Drilling Apparatus, said copendingapplication being one with which applicants herein are familiar. Brieflystated, however, the quick-release valve 92 is one which, when pressureon the inlet side decreases, will vent to atmosphere. The pneumaticpulse produced by the valve 74 passes from the quick-release valve 92through port 98 to the remote receiving recorder (not shown) for apurpose as will be hereinafter set forth.

The fitting 96 is in communication with a cam operated valve 100. Asimilar fitting 102 is also in communication with the valve and aconduit 104 extends between the valve 76 and the fitting 102 to providecommunication between the valves 76 and 100. The valve 100 is providedwith a suitable slide or spool member, or the like (not shown), thereinmovable for alternating flow to the valve 100 from the fittings 96 and102. In other words, in one position of the spool member, fluid flowsinto the valve 100 from the fitting 96 and out of the valve 100 througha similar fitting 106 into a conduit 108. In a second position of thespool member, flow is precluded from the fitting 96 but opened betweenthe fittings 102 and 106. An arm member 110 is pivotally secured at 112to a support bracket 114 carried by the valve 100. A roller member 116is journalled on the outer extremity of the arm 110 for engaging a cammember 118. A spring urged plunger 120 is provided in the valve 100 foractuation of the spool member and the plunger 120 extends from the valve100 into engagement with the arm 110. The cam 118 is pivotally securedat 122 to a support member 124 which in turn is secured to the housing34. The outer periphery of the cam 118 is provided with a cam detent 126for engaging the roller 116 in one position of the cam 118 whereby thearm 110 is urged or retained in a position with respect to the valve 100for urging the plunger 120 in a right hand direction as viewed in FIGURE2 whereby communication is established between the fittings 102 and 106.When the cam 118 is rotated about the pivot 122 in a clockwise directionin a manner as will be hereinafter set forth, the cam is moved away fromthe roller 116 and the roller 116 is released from the engagement withthe detent 126 whereby the spring urged plunger moves in a left handdirection, as viewed in FIGURE 2, in order to establish communicationbetween the fittings 96 and 106 and close communication between thefittings 102 and .106. l

The valve 76 is a cam operated valve similar to the valve '74 and an arm128 in association therewith is pivotally secured at 130 to a supportbracket 132 carried by the valve 76. A roller 134 is journalled at theouter extremity of the arm 128 for engagement by the lug or pawl 62 aswill be hereinafter set forth. A spring urged plunger 136 is provided inthe valve 76 and extends outwardly therefrom into engagement with thearm 128 and a spring 138 is anchored between the outer extremity of thearm 128 and the valve 76 for constantly urging the arm 128 against theouter end of the plunger 136. The plunger 136 is normally in an extendedposition as shown in FIGURE 2 whereby the valve 76 is closed. However,when the pawl 62 engages the roller 134, the arm 128 is moved in aclockwise direction about the pivot 130 for moving the plunger 136inwardly with respect to the valve 76 for opening thereof. In the openposition of the valve 76, pneumatic fluid moves therethrough and intothe conduit 104 where it is directed to the fitting 102. As hereinbeforeset forth, the gear 54 is rotated through one complete revolution uponeach five feet of drilling progress. Thus, the pawl 62 is brought intoengagement with the roller 134 upon the completion of each five feet. ofdrilling. It will be apparent that the valve 76 is, therefore, openedfor sending a pneumatic pulse to the fitting 102 upon the completion ofeach five feet of drilling.

The conduit 108 extends from the flitting 106 of the valve 100 to asuitable fitting or elbow 140 which is connected to a quick-release orquick-exhaust valve 142 similar to the valve 92. The pneumatic pulsedirected to the valve 142 by .the valve 100 passes from the valve 142through port 144 to the remote receiving recorder (not shown) for apurpose as will be hereinafter set forth.

As particularly shown in FIGURE 4, a pivot shaft 146 extends through thesupport member 124 and into connection with the cam 118 at the pivotpoint 122 thereof. A suitable collar 148 is secured around the shaft 146by a set screw, or the like, (not shown), and a handle member 150 issecured to the outer extremity of the shaft 146 by a set screw 152. Apair of spaced outwardly ex tending pins 154 and 156 are provided on oneface of the cam 118 for engagement with the support member 124 in such amanner that the pin 1S6 limits the counterclockwise rotation of the cam118 and the pin 154 limits the clockwise rotation of the cam 118. Ofcourse, rotation of the shaft 146 by manual movement of the handle 150rotates the cam 118. The shaft 146 extends through an aperture (notshown) in the cover 32 and the handle 150 is disposed exteriorly of thecover. An arcuate indicating plate 158 may be provided on the outersurface of the cover 36 in the proximity of the outer extremity of thearm 150 and suitable indicia may be imprinted on the face of the coverplate 36 adjacent the upper most and lower most portions of theindicating plate 158 as shown in FIGURE 1.

In the event the recorder unit 10 with which the transmitter 32 is to beutilized has been previously provided with a rotatable handle member andshaft similar to the shaft 146 and handle 150, it will be necessary toremove the handle associated with the recorder unit 16 whereby the shaftof the recorder 10 will 'be exposed. In this event, a coupling member160 may be disposed on the exposed shaft. The coupling 160 is providedwith a central bore 162 and a radially inwardly extending recess 164.The bore 162 receives the exposed shaft of the recorder unit 10 and theelongated recess 164 receives a pin member 166 which may be an extensionof the pin member 154. This will couple the cam 118 to the shaft of theexisting recorder. It is to be understood that some recorder units mayhave such a shaft whereas other recorder units may not be provided withthis mechanism. Of course, a suitable aperture (not shown) is providedin the housing 34 for receiving the coupling member 160 and the outerend of the exposed shaft with which the coupling member is engaged.

OPERATION The transmitter 32 may be installed or mounted onsubstantially any existing recorder unit 10 of the type hereinbefore setforth, such as that shown in Patent No. 3,010,777, without alteration ofthe internal structure of the recorder unit. The dial 29 and pointer 31may be removed from the housing 12 and the housing 34 may 'be secured tothe housing 12 in lieu thereof. The shaft 40 of the transmitter 32 maybe connected with the shaft of the recorder unit which is exposed uponremoval of the dial and pointer. The eccentric shaft 56 may be manuallyrotated about the stud 58 for proper orientation of the gear 54 withrespect to the gear 52 for assuring a meshing therebetween whereby thegear 54 will be rotated by the gear 52. When the proper position isachieved for the gear 54, the shaft 56 may be securely tightened orlocked into position by a full tightening of the stud 58 in the housing34. The dial 29 and pointer 31 may be secured to the cover 34 with thepointer 31 being suitably connected with the reduced neck portion 41 ofthe shaft 40 for simultaneous rotation therewith. The shaft 146 may beconnected to the pivot point 122 of the cam 118 and the handle 150 maybe secured to the outer end of the shaft 146 in order that the cam 118may be rotated by the manual movement of the handle 150. Of course, inthe event the recorder unit 10 is provided with a similar handlemem'ber, this handle may be removed and the cam 118 may be coupled withthe shaft exposed by removal of the handle by means of the couplingmember 16%).

In addition, the fitting member 64 is connected with the rig air througha suitable conduit (not shown) and the port 98 is connected through asuitable conduit (not shown) to the remote recorder (not shown), such asthat set forth in the co-pending application Ser. No. 223,358, forproviding pneumatic impulses to the five foot offset marker portion ofthe recorder. The port 144 is similarly connected with the remoterecording unit in a manner to provide pneumatic impulses with thefootage recording portion thereof. Thus, the transmitter 32 is actuatedby the mechanical operation of the recorder unit 10 for transmittingpneumatic pulses to the remote recorder for the operation of thepneumatic portions thereof.

Rig air enters the transmitter 32 through the fitting 64 and passesthrough the pressure regulator or control valve 66 Where the pressure ofthe rig air may be controlled to provide flow of pneumatic fluid throughthe con duit 68 at a predetermined or preselected pressure. For purposesof the present invention, it is preferable that this air pressure bemaintained substantially at psi. The pneumatic fluid is directed throughthe conduit 68 to the T-fitting 70 where a portion of the fluid isdirected to the valve 76 and the remaining portion to the conduit 72. Ofcourse, if the valve 76 is in a closed position, the pneumatic fluidcannot enter the valve. The fluid in the conduit 72 is directed to thevalve 74 and as long as the valve 74 is closed as well as the valve 76,the pressure remains in the conduits 68 and 72.

The shaft 40 is connected with the rotatable shaft of the recorder unit10 which is rotated by the movements of the cable 24. As hereinbeforeset forth, the cable 24 closely follows the movement of the drillingstring, thus the shaft 40 is rotated in a clockwise direction in amanner closely following the drilling progress of the drill string.

The cam 42-44 rotates simultaneously with the shaft 40 and ashereinbefore set forth, rotation of the shaft 40 is preferably inconstant timed relation with the drilling progress so as to provide onecomplete revolution thereof during each two feet of drilling. As aresult, one of the cam surfaces 48 will be brought into engagement withthe roller 84 of the arm 78 upon the drilling of one foot since there istwo oppositely disposed cam surfaces 48 on the cam 42-44. As the camsurface 48 engages the roller 34, the arm 78 is pivoted in acounterclockwise direction for urging the piston 79 in a direction foropening of the valve 74, thus permitting the fluid in the conduit 72 tobe directed to the conduit 88. As soon as the cam surface 48 movesthrough a suflicient distance for disengagement with the roller 84whereby the roller will be positioned in the next succeeding recess 50,the spring urged plunger 79 will return to the normal position thereoffor closing the valve 74. In this manner, a pneumatic pulse isintroduced into the conduit 88 upon the drilling of each foot.

The pneumatic fluid in the conduit 88 is directed to the T-fitting 90where the fluid flow is split with a portion thereof being directed tothe quick-exhaust valve 92 and a remaining portion being directed to theconduit 94. The fluid directed to the valve 92 passes therethrough tothe port 98 and subsequently to the five foot off-set recording portionof the remote recorder. Thus, a pneumatic pulse is delivered to the fivefoot off-set portion of the remote recorder upon each foot of drilling.When the cam surface 48 clears the roller 84, the quick-exhaust valve 92exhausts to atmosphere the remainder of the pneumatic impulse directedto the port 98.

The fluid in the conduit 94 is directed to the valve through the fitting96. As hereinbefore set forth, when the cam 118 is so positioned thatthe cam is not engaged by the roller 116, the spool member (not shown)within the valve 100 is so positioned as to provide communicationbetween the fitting 96 and the outlet fitting 106. In this position ofthe valve 100, the fluid from the conduit 94 passes through the valve100 and into the conduit 108 where it is directed through the fitting tothe quickexhaust valve 142. The fluid passes through the valve 142 tothe port 144 and to the footage recording portion of the remoterecorder. As long the cam member 118 is retained in a position out ofengagement with the roller 116, a pneumatic pulse will be directed tothe port 144 to the footage recording portion upon each foot ofdrilling. Of course, the quick-exhaust valve 142 will exhaust theremainder of the impulse to atmosphere when the cam surface 48 clearsthe roller 84.

In a relatively slow drilling operation, it is desirable to position thecam 118 in such a manner that the valve 100 directs fluid from theconduit 94 to the valve 142. This results in a recording or marking onthe chart (not shown) of the remote recorder upon the drilling of eachfoot in the drilling operation. Of course, the five foot off-setrecording portion is in continuous communication with the fluid from theconduit 88 and, thus, receives a pneumatic impulse upon each foot ofdrilling progress to send a signal to the five foot off-set recordingdevice for actuation thereof whereby the five foot off-set record isinscribed on the chart upon the drilling of each five feet in thedrilling operation.

As hereinbefore set forth, the gear 54 is rotated by the gear 52 in sucha manner as to provide one complete rotation of the gear 54 upon eachfive feet of drilling. Thus, the pawl 62 engages the roller 134 upon thedrilling of each five feet. When the roller 134 is engaged by the pawl62, the arm 128 is rotated in a clockwise direction for depressing theplunger 136 for opening the valve 76. When the valve 76 is opened, aportion of the pneumatic fluid in the fitting 70 is directed through thevalve 76 and to the conduit 104 where the fluid is directed to thefitting 102. If the cam 118 is set in the one foot marker positionhereinbefore described, the fluid from conduit 104 cannot enter thevalve 100. However, when the earn 118 is rotated by manipulation of thehandle 150 whereby the detent 126 is in engagement with the roller 116,the spring urged plunger 120 moves inwardly with respect to the valve100 for moving the spool member to a position wherein fluid flow betweenthe fitting 96 and 106 is precluded and communication is establishedbetween the fittings 102 and 106. In this position of the valve 100,fluid passes from the conduit 104 through the valve 100 and to theconduit 108 where it is transmitted to the quickexhaust valve 142. Aslong as communication is main tained between the fittings 102 and 106, apneumatic pulse is directed through the valve 142 to the port 144 uponeach five feet of drilling. This setting is particularly desirable in afast drilling operation and results in a marking on the chartcorresponding with each five feet of drilling progress. Of course, thefive foot off-set marking continues on the chart regardless of whetheror not the earn 118 is in the one foot or five feet position.

By way of summary, when it is desired to make a chart or graphic recordreflecting the progress of a fast drilling operation, it is preferableto position the lever or handle 150 in a down or five foot position asshown in FIG- URE 1 whereby the cam 118 is in engagement with the roller116. Communication is thus established and maintained between the valve76 and the port 144 through the valve 100. Rig air is directed to theregulator 66 where the pressure thereof is reduced to approximately 80p.s.i. From the regulator 66, the pneumatic fluid moves through theconduits 68 and 72 to the valves 76 and 74. The valve 74 is opened uponeach foot of drilling progress whereby a pneumatic pulse is delivered tothe port 98 and to the fitting 96. The pulse from the port 98 isdirected to the five foot ofl-set marking portion of the remote recorderfor actuation thereof in the manner set forth in the aforementionedco-pending application Ser. No. 223,358. The pulse delivered from thevalve 74 to the fitting 96 cannot enter the valve 100 and thus no pulseis sent to the port 144 from the valve 74. The valve 76 is opened uponeach five foot of drilling progress whereby a pneumatic pulse isdirected to the fitting 102. In this five foot setting for the cam 118,communication is established through the valve 100 between the fittings102 and 106 and thus the pneumatic pulse is directed from the valve 76to the port 144. This pulse is sent to the footage recording portion ofthe remote recorder for actuation thereof to inscribe or mark the chartwith a suitable line or indication representing each five feet completedin the drilling progress.

When the drilling operation is being performed at a slower rate ofspeed, the handle 150 may be moved to the up position or 1 ft. position,as shown in FIGURE 1, for moving the cam 118 out of engagement with theroller 116. This actuates the valve for shunting the flow of fluidthrough the valve whereby fluid moves from the fitting '96 to thefitting 106, but is precluded from flowing between the fittings 102 and106. The valve 74 is opened upon each foot of drilling progress wherebya pneumatic pulse is delivered to the port 98 and the fitting 96. Thispulse is directed through the valve 100 to the port 144 where it is sentto thefootage recording portion of the remote recorder for actuationthereof to record or indicate on the chart a marking for each foot ofdrilling progress. Substantially simultaneously a pulse is sent from theport 98 to the five foot off-set marking portion of the remote recorderfor actuation thereof, as hereinbefore set forth. The valve 76 is openedupon each five feet of drilling progress for delivering a pneumaticpulse to the fitting 102. However, with the cam 118 in the one footsetting position, the pulse cannot enter the valve 100.

From the foregoing, it will be apparent that the present inventionprovides a novel transmitter which may be utilized with existingrecording apparatus without internal alteration of the structurethereof. The transmitter converts the mechanical action of the recorderunit into pneumatic pulses with said pneumatic pulses bein g directed toa pneumatically operated and remotely disposed recording unit. It is tobe noted that the novel transmitter of the invention may also beutilized with a metering wheel, or the like, in lieu of the recorderunit. The transmitter assembly in this instance would be utilized tosend pneumatic signals to a remote recorder thereby eliminating therecord of the recording unit itself.

Changes may be made in the combination and arrangement of parts asheretofore set forth in the specification and shown in the drawings, itbeing understood that any modification in the precise embodiment of theinvention may be made within the scope of the following claims, withoutdeparting from the spirit of the invention.

What is claimed is:

1. In combination with a recorder unit having a shaft in associationtherewith rotatable in timed] relation to the rate of drilling speed ofa drilling operation, a transmitter assembly for converting themechanical rotation of the shaft into pneumatic signals, saidtransmitter assembly comprising cam means connected with the shaft forrotation thereby, pawl means rotatable by said shaft independ* ent ofsaid cam means, first valve means, second valve means, third valvemeans, a first outlet port, a second outlet port, means for directingpneumatic fluid to the first and second valve means, means connectingthe first valve means with the first outlet port and with the thirdvalve means, means connecting the second valve means with the thirdvalve means, means connecting the third valve means with the secondoutlet port, said first valve means operable by said cam means inresponse to a first increment of drilling for intermittently sending apneumatic pulse substantially simultaneously to the first outlet portand the third valve means, said second valve means operable by said pawlmeans in response to a second increment of drilling different from saidfirst increment of drilling to intermittently send a pneumatic pulse tothe third valve means, and means associated with said third valve meansfor actuation thereof to selectively provide communication between thesecond outlet port and the first and second valve means.

2. In combination with a recorder unit, a transmitter assembly forconverting the mechanical movements of the recorder unit into pneumaticpulses, first valve means operable to alternate open and closedpositions by said recorder unit in response to the completion of a firstincrement of drilling, second valve means operable to alternate open andclosed positions by said recorder unit in response to the completion ofa second increment of drilling different from said first increment ofdrilling, means for directing pneumatic fluid to the first and secondvalve means, selective valve means connected with the first and secondvalve means for receiving pneumatic pulses therefrom upon opening ofsaid first and second valves, first port means in communication withsaid first valve means for receiving a pneumatic pulse therefrom uponopening thereof, and second port means in communication with saidselector valve for selectively receiving pneumatic pulses from eithersaid first or said second valve means.

3. In combination with a recorder unit having a shaft in associationtherewith rotatable in timed relation to the rate of drilling speed in adrilling operation, a transmitter assembly for converting the mechanicalrotation of the shaft into pneumatic pulses, said transmitter comprisinghousing means secured to the recorder unit, main shaft means connectedwith the recorder unit shaft for rotation thereby, cam means carried bythe main shaft means for rotation simultaneously therewith, a first gearcarried by said main shaft means for rotation simultaneously therewith,a second gear journalled in the housing and engageable with the firstgear for rotation thereby, pawl means carried by the second gear forrotation therewith, first valve means provided in the housing, secondvalve means provided in the housing, selective valve means provided inthe housing, means for directing pneumatic fluid tothe first and secondvalve means, means connecting the selective valve to the first andsecond valve means, a first outlet port interposed between the firstvalve means and selective valve means, second outlet port means incommunication with the selective valve means, said first valve meansoperable by the cam means for intermittent opening thereof to send apneumatic pulse to the first outlet port and the selective valve means,said second valve means operable by the pawl means for intermittentopening thereof to transmit a pneumatic pulse to the selective valve,means for actuating the selective valve means for selectively providingcommunication between the first valve means and the second outlet portand between the second valve means and the second outlet port.

4. In combination with a recorder unit having a shaft in associationtherewith rotatable in timed relation to the rate of drilling speed in adrilling operation, a transmitter assembly as set forth in claim 3wherein the second gear is journalled on an eccentrically mounted shaftwhereby the second gear may be orientated with respect to the first gearfor assuring efiicient meshing there'between.

5. In combination with a recorder unit having a shaft in associationtherewith rotatable in timed relation to the rate of drilling speed in adrilling operation, a transmitter assembly as set forth in claim 3wherein the cam means comprises a sectional member having oppositelydisposed substantially cylindrical cam surfaces with oppositely disposedrecesses interposed there'between, said cam surfaces cooperating withsaid first valve means for opening thereof in timed relation with thefootage drilled in a drilling operation.

6. In combination with a recorder unit having a shaft in associationtherewith rotatable in timed relation to the rate of drilling speed in adrilling operation, a transmitter assembly as set forth in claim 5wherein the ratio between the first and second gears is two and a halfto one whereby the second valve means is opened in timed relationship tothe footage drilled in a drilling operation and which corresponds to aratio of one to five with respect to the opening of the first valvemeans.

7. A transmitter assembly for converting mechanical movement intopneumatic impulses and comprising a housing, a shaft extending into thehousing and rotatable by mechanical means, a cam member carried by theshaft for rotation simultaneously therewith, a first gear carried by theshaft and rotatable therewith, a second gear journalled in the housingfor engagement with the first gear for rotation thereby, eccentric shaftmeans for journalling the second gear to the housing in a mannerproviding for orientation of the second gear with respect to the firstgear, a pawl member carried by the second gear and rotatable therewith,a first cam operated valve provided in the housing, a second camoperated valve provided in the housing, pressure regulating meansprovided in the housing and in communication with the first and secondvalves for directing pneumatic fluid thereto, a first port incommunication with the first valve, a quick-exhaust valve interposedbetween the first port and the first valve, a cam operated selectivevalve in communication with both the first and second valves, a secondport in communication with the selective valve, a quick-exhaust valveinterposed between the second port and the selective valve, said firstcam operated valve actuated by the cam member for intermittent openingthereof to direct intermittent pneumatic impulses to the first port andselective valve, said second valve operable by said pawl member forintermittently opening thereof to direct intermittent pneumatic impulsesto the selective valve, and manually operable cam means in associationwith said selective valve for actuation thereto to selectively providecommunication between the second port and the first and second valves.

8. A transmitter assembly as set forth in claim 7 wherein the cam membercarried by the shaft comprises a sectional body member having a pair ofoppositely disposed arcuate cam surfaces with oppositely disposedrecesses interposed therebetween whereby the first valve is opened andclosed two times during a single revolution of the cam.

9. A transmitter as set forth in claim 7 wherein the ratio between thefirst and second gears is two and a half to one whereby the second gearrotates through one complete revolution upon each two and a halfrevolutions of the first gear in order that the second valve is openedone time for each two and a half revolutions of the first gear.

10. A transmitter assembly as set forth in claim 7 wherein the camcarried by the shaft is provided with a pair of oppositely disposed camsurfaces engageable with the first valve for opening of the valve twotimes during a single revolution of the shaft, and the ratio between thefirst and second gears is two and a half to one whereby the second gearrotates through one revolution for each two and a half revolutions ofthe first gear in order that the pawl will engage the second valve foropening thereof one time for each five times of the opening of the firstvalve.

11. In combination with a recorder unit having a mechanically rotatableshaft therein, a transmitter assembly for converting the mechanicalrotation of the shaft into pneumatic signals without alteration of theinternal structure of the recorder unit, said transmitter assemblycomprising a main shaft connected to the recorder unit shaft forrotation thereby, cam means carried by the main shaft for simultaneousrotation therewith, first gear means carried by the shaft and rotatabletherewith, second gear means rotatably driven by said first gear means,pawl means carried by the second gear means, first valve meansintermittently opened by the cam means, second valve meansintermittently opened by the pawl means, means for directing pneumaticfluid to the first and second valve means, selective valve means incommunication with both the first and second valve means, first portmeans interposed between the first valve means and the selective valvemeans, a second port means in communication with said selective valvemeans, and means for actuation of the selective valve means forselectively providing communication between the second port means andthe first and second valves.

12. In combination with a recorder unit having a mechanically rotatableshaft therein, a transmitter assembly as set forth in claim 11 whereinthe relationship between the sizes of the two gear means is such thatthe first valve 13 is opened two times during a single revolution of thecam means, and the sec-nd valve is opened one time for each two and ahalf revolution of the cam means.

13. A transmitter assembly for converting mechanical movement intopneumatic pulses and comprising a housing, a fitting member carried bythe housing for receiving a pneumatic fluid, pressure regulating meansin communication with the fitting for receiving the pneumatic fluidtherefrom and regulating the pressure thereof, first and second camoperated valve members provided in the housing, conduit means providingcommunication of the pneumatic fluid from the pressure regulating meansto the first and second valves, a mechanically rotatable shaft extendingthrough the housing, a cam member carried by the shaft for rotationtherewith, a second gear member journalled in the housing for engagementwith the first gear member for rotation thereby, eccentric shaft meanssecured to the housing for journalling of the second gear means in amanner providing orientation of the second gear member with respect tothe first gear member, a pawl member carried by the second gear memberand rotatable therewith, said cam member comprising a pair ofsubstantially identical oppositely disposed half sections secured aroundthe shaft and having two oppositely disposed arcuate cam surfaces withtwo oppositely disposed recesses interposed therebetween whereby thefirst cam operated valve is engaged by the arcuate cam surfaces foropening of the valve two times upon each revolution of the cam, saidfirst and second gear members having a ratio of two and a half to onewhereby the second gear is rotated through one complete revolution uponeach two and onehalf revolutions of the first gear in order that thepawl member will engage the second cam operated valve for openingthereof one time during each two and a half revolutions of the shaft, aport member carried by the housing, a quick-exhaust valve incommunication with the port member, conduit means providingcommunication between the first cam operated valve and the quick exhaustvalve, a selective valve provided in the housing, conduit meansproviding communication between the first cam operated valve and theselective valve, conduit means providing communication between thesecond cam operated valve and the selective valve, a second port carriedby the housing, a second quick-exhaust valve in communication with thesecond port, conduit means providing communication between the secondquick-exhaust valve and the selective valve, pivotal arm means carriedby the selective valve for operation thereof to provide selectivecommunication between the second quick-exhaust valve and the first andsecond cam operated valve, and a manually rotatable cam memberjournalled in the housing for actuation of the pivotal arm means foroperation of the selective valve.

14. In combination with a recorder unit having a shaft in associationtherewith rotatable in timed relation to the rate of drilling speed of adrilling operation, a transmitter assembly for converting the mechanicalrotation of the shaft into pneumatic pulses, said transmitter assemblycomprising a housing, a fitting member carried by the housing forreceiving a pneumatic fluid, pressure regulating means in communicationwith the fitting for receiving the pneumatic fluid therefrom andregulating the pressure thereof, first and second cam operated valvemembers provided in the housing, conduit means providing communicationof the pneumatic fluid from the pressure regulating means to the firstand second valves, a main shaft extending through the housing andconnected with the shaft of the recorder unit for rotation thereby, acam member carried by the main shaft for rotation therewith, a firstgear member carried by the main shaft for rotation therewith, a secondgear member journalled in the housing for engagement with the first gearmember for rotation thereby, eccentric shaft means secured to thehousing for journalling of the second gear means in a manner providingorientation of the second gear member with by the second gear member androtatable therewith, said cam member comprising a pair of substantiallyidentical oppositely disposed half sections secured around the mainshaft and having two oppositely disposed arcuate cam surfaces with twooppositely disposed recesses interposed therebetween whereby the firstcam operated valve is engaged by the arcuate cam surfaces for opening ofthe valve two times upon each single revolution of the cam with saidopenings of said first cam operated valve being in timed relation witheach foot of drilling in the drilling operation, said first and secondgear members having a ratio of two and a half to one whereby the secondgear is rotated through one complete revolution upon each two and a halfrevolutions of the first gear in order that the pawl member will engagethe second cam operated valve for opening thereof one time during each.two and a half revolutions of the shaft with said opening of said secondcam operated valve being in timed relation with five feet of drilling inthe drilling operation, a port member carried by the housing, aquick-exhaust valve in communication with the port member, conduit meansproviding communication between the first cam operated valve and thequick exhaust valve, a selective valve provided in the housing, conduitmeans providing communication between the first cam operated valve andthe selective valve, conduit means providing communication with thesecond port, conduit means providing communication between the secondquick-exhaust valve and the selective valve, pivotal arm means carriedby the selective valve for operation thereof to provide selectivecommunication between the second quick-exhaust valve and the first andsecond cam operated valve, and a manually rotatable cam memberjournalled in the housing for actuation of the pivotal arm means foroperation of the selective valve.

15. In combination with a recorder unit of the type having a first shaftassociated therewith and rotatable in timed relation to the rate ofdrilling speed of a drilling operation, said first shaft having aportion thereof projecting outwardly from one side of said recorderunit, said recorder unit also having a rotatable second shaft projecting outwardly from said side of said recorder unit, said rotatablesecond shaft being rotatable to two different positions for causing saidrecorder unit to record two different increments of drilling speedrespectively, a separate transmitter assembly comprising a housingattachable to said side of said recorder unit and over said first andsecond shafts of said recorder unit, a main shaft journalled in saidhousing, said main shaft being connected with said transmitter assemblyin driving relation with said first shaft of said recorder unit, a cammember carried by the main shaft for rotation therewith, said cam membercomprising a pair of substantially identical oppositely disposed halfsections secured around the rnain shaft and having two oppositelydisposed arcuate cam surfaces with two oppositely disposed recessesinterposed therebetween, a first gear member carried by said main shaftfor rotation therewith, an eccentric shaft means secured to said housingin spaced relation with said main shaft, a second gear member journalledfor rotation on said eccentric shaft means and engageable with saidfirst gear member for rotation thereby, said eccentric shaft means beingrotatable about an off-set axis in a manner providing proper meshing ofsaid second gear member with said first gear member, a pawl membercarried by said second gear member and rotatable therewith, a first camoperated valve mounted in said housing adjacent said first gear memberand having thereon an operating arm engageable by said cam member, asecond cam operated valve mounted adjacent said second gear member andhaving an operating arm engageable by said pawl, a first fitting membercarried by said housing for receiving a supply of pneumatic fluid underpressure, a pressure regulating means in communication with said fittingfor receiving the pneumatic fluid therefrom and regulating the pressurethereof, conduit means providing communication between the pressureregulating means and said first and second valves, 21 first port membercarried by said housing, a first quick-exhaust valve in communicationwith said first port means, conduit means providing communicationbetween said first quick-exhaust valve and said first cam operatedvalve, a second port member and a second quick-exhaust valve incommunication with said second port member, a selective valve providedin the housing, conduit means connecting said selective valve to saidsecond quick-exhaust valve, conduit means providing communicationbetween said selective valve and said first quick-exhaust valve and saidfirst cam operated valve, conduit means connecting said selective valvewith said second cam operated valve, pivotal arm means carried by theselective valve for operation thereof providing selective communicationbetween the first quickexhaust valve and said first and second camoperated valves respectively, a manually rotatable rod journalled insaid housing and being coupled to said second shaft of said recorderunit, and a rotatable cam member mounted on said rod and rotatabletherewith for actuation of the pivotal arm means for operation of saidselective valve.

16. In combination with a recorder unit of the type having a first shaftassociated therewith and rotatable in timed relation to the rate ofdrilling speed of a drilling operation, said first shaft having aportion thereof projecting outwardly from one side of said recorderunit, a separate transmitter assembly comprising a housing attachable tosaid side of said recorder unit and over said first and second shafts ofsaid recorder unit, a main shaft journalled in said housing, said mainshaft being connected with said transmitter assembly in driving relationwith said first shaft of said recorder unit, a cam member carried by themain shaft for rotation therewith, said carn member comprising a pair ofsubstantially identical oppositely disposed half sections secured aroundthe main shaft and having two oppositely disposed arcuate cam surfaceswith two oppositely disposed recesses interposed therebetween, a firstgear member carried by said main shaft for rotation therewith, aneccentric shaft means secured to said housing in spaced relation withsaid main shaft, a second gear member journa'lled for rotation on saideccentric shaft means and engageable with said first gear member forrotation thereby, said eccentric shaft means being rotatable about anofi-axis in a manner providing proper meshing of said second gear memberwith said first gear member, a pawl member carried by said second gearmember and rotatable therewith, a first cam operated valve mounted insaid housing adjacent said first gear member and having thereon anoperating arm engageable by said cam member, a sec-0nd cam operatedvalve mounted adjacent said second gear member and having an operatingarm engageable by said pawl, a first fitting member carried by saidhousing for receiving a supply of pneumatic fluid under pressure, apressure regulating means in communication with said fitting forreceiving the pneumatic fluid therefrom and regulating the pressurethereof, conduit means providing communication between the pressureregulating means and said first and second valves, a first port membercarried by said housing, a first quick-exhaust valve in communicationwith said first port means, conduit means providing communicationbetween said first quick-exhaust valve and said first cam operatedvalve, a second port member and a second quick-exhaust valve incommunication with said second port member, a selective valve providedin the housing, conduit means connecting said selective valve to saidsecond quick-exhaust valve, conduit means providing communicationbetween said selective valve and said first quick-exhaust valve and saidfirst cam operated valve, conduit means connecting said selective valvewith said second cam operated valve, pivotal arm means carried by theselective valve for operation thereof providing selective communicationbetween the first quick-exhaust valve and said first and second Ca-rnoperated valves respectively, a manually rotatable rod journalled insaid housing, and a rotatable cam member mounted on said rod androtatable therewith for actuation of the pivotal arm means for operationof said selective valve.

References Cited UNITED STATES PATENTS 2,678,519 5/1954 Honiss137624.134

ALAN COHAN, Primary Examiner.

1. IN COMBINATION WITH A RECORDER UNIT HAVING A SHAFT IN ASSOCIATIONTHEREWITH ROTATABLE IN TIMED RELATION TO THE RATE OF DRILLING SPEED OF ADRILLING OPERATION, A TRANSMITTER ASSEMBLY FOR CONVERTING THE MECHANICALROTATION OF THE SHAFT INTO PNEUMATIC SIGNALS, SAID TRANSMITTER ASSEMBLYCOMPRISING CAM MEANS CONNECTED WITH THE SHAFT FOR ROTATION THEREBY, PAWLMEANS ROTATABLE BY SAID SHAFT INDEPENDENT OF SAID CAM MEANS, FIRST VALVEMEANS, SECOND VALVE MEANS, THIRD VALVE MEANS, A FIRST OUTLET PORT, ASECOND OUTLET PORT, MEANS FOR DIRECTING PNEUMATIC FLUID TO THE FIRST ANDSECOND VALVE MEANS, MEANS CONNECTING THE FIRST VALVE MEANS WITH THEFIRST OUTLET PORT AND WITH THE THIRD VALVE MEANS, MEANS CONNECTING THESECOND VALVE MEANS WITH THE THIRD VALVE MEANS, MEANS CONNECTING THETHIRD VALVE MEANS WITH THE SECOND OUTLET PORT, SAID VALVE MEANS OPERABLYBY SAID CAM MEANS IN RESPONSE TO A FIRST INCREMENT OF DRILLING FORINTERMITTENTLY SENDING A PNEUMATIC PULSE SUBSTANTIALLY SIMULTANEOUSLY TOTHE FIRST OUTLET PORT AND THE THRID VALVE MEANS, SAID SECOND VALVE MEANSOP-